Diaphragm pumps, also known as membrane pumps, are used to transfer large volumes of liquid. They get their name from the two flexible diaphragms that work to move liquid in and out. These diaphragms are linked through a central shaft where the air valve is located. Moving in a forward and backward motion, the diaphragm pump creates a temporary vacuum where the liquid is suctioned in and then squeezed out.
Diaphragm pumps are highly versatile. They can be used to process flammable, abrasive, and corrosive liquids. This efficient machine can also be used on liquids with varying viscosities, including those with a high concentration of solids.
The machine itself may be made from stainless steel, aluminum, cast iron, or other kinds of industrial material. The diaphragms can be made from several different materials, which include rubber, polytetrafluoroethylene (PTFE), and thermoplastic elastomer (TPE). The latter is typically more resistant to harsh liquids.
Generally, diaphragm pumps have a superb self-priming ability with a maximum efficiency of 97%. They are easy to clean and maintain, have a large displacement volume, and can be safely used in the food industry. Many modern pumps are also made oil-free to prevent issues with product purity.
Diaphragm pumps have a good lifting capacity or the height at which the pump can effectively lift material. This machine's ability to pick up liquid, slurries, wettable powders, and even sludge makes it an invaluable piece of equipment in many situations and conditions.
There are several types of diaphragm pumps, the most common being the air-operated double diaphragm (AODD) pump. It works by delivering pressurised air between two chambers to create a suction in one and a discharge pump in another. An AODD creates a pulsating discharge, which may be adjusted through a pulsation damper.
Small electric or motor-driven diaphragm pumps may be used for thinner liquids requiring less pressure. These pumps typically deliver 60 to 100 PSI. Larger, shaft-operated pumps known as Wanner Hydra-Cell pumps can deliver as much as 2,500 PSI at a flow rate of 36 GPM. These pumps are more suited for handling abrasive chemicals, boiling hot fluid, oil, mud, acids, and other aggressive liquids.
The forward and backward movement of a diaphragm pump is powered by different drive options. The most popular ones are the pneumatic, hydraulic, and electrical drive pumps. Electric drivers or actuators deliver more precision than the other two, but at a weaker force. Pneumatic actuators tend to produce results much faster than electric and hydraulic drivers, making them your best bet if you need work done more quickly.
When choosing among several diaphragm pumps for sale, make sure to check their performance curve. The pump's performance curve contains essential details for proper use, including the amount of air that it needs to run properly. Note the operating capacity when browsing through a diaphragm pump's information sheet. It should run at half (50%) of its highest potential during a regular run. This ensures that the pump can operate for an extended period without needing too much maintenance. A diaphragm pump for sale will typically list all the information you need to know.
